Features: A specially developed mask to give City cyclists with broad spectrum filtration against pollution.,Uses a Dynamic Activated Charcoal Cloth to filter the worst of urban pollution.,Includes two Techno valves to allow easier exhalation, which is particularly important as they release heat, water vapour and Carbon Dioxide.,Comes in two sizes, with a contoured shape for a snug and comfortable fit and Velcro pads for easy application.,Made from hypo-allergenic Neoprene giving a comfortable and secure fit.,The filter is replaceable, and is designed to remain fully effective for at least 1 month of normal daily use in the urban environment.,.